# BH-CUR-01 — Unknown currency code

> https://billhorse.com/en/rules/bh-cur-01/

## What does this error mean?

The currency code (BT-5) is not an active ISO 4217 code — either a typo or a withdrawn code (e.g. CUC, HRK).

## How to fix it

Use a current ISO 4217 code (e.g. EUR); replace withdrawn codes with the successor currency.